Drive Away Corpses

I am a corpse collector, and my mission this time is to collect corpses from the battlefield and return the client's remains to their hometowns and bury them in peace. As I shook the golden bell in my hand, five corpses with missing arms and legs staggered into a row in front of me. They were still talking and laughing along the way. I was curious, how could they laugh even after they were turned into corpses?